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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7455c487bc16437b46581a524aebbc2e58c7c961868b87b4667353bed4835b9b' 
  AND token = 'gx7ylDDmfYMIr6S6pF1EeMsqTgt+ByeuDBH5INNG1S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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