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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6f4d4555a1ac53c8e3aa09b0fb76bbe928b029892620afa2b813e1d1342249' 
  AND token = 'KHh39x8xAlw0TLOd40qEPVsrLHg6+chBQcohUjSEI3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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