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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9821b1b1ec3c31fb75edfe8a7b5e52831a15bcdb6a3c5365e5dd76db6d5f1bb' 
  AND token = 'L52R8X4mbf9jaOBsHVf5Vr41HcTDku2daz+gzsck6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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