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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e022bc6cb6b5ab483ace82aeba74cded472842bf0eff573b3b60b987fe3fbfd9' 
  AND token = 'GBPSovlmXn1UPx/2jtWjkEjr6/6xlcifO+gzWrsTKxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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