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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58ceee9ffefac960789bc5ae4fd5947404ef91a12de60691f5695781e843a58' 
  AND token = '760RcTcs/1OS3Ja+oCfPDesD4qKhEcJxQYugk9BO3AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}