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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430a7580b1be5c49a5d6f9e1bdd74feb375b73fd5338871b084056833330365c' 
  AND token = '0KvVGkRHVcPY3wTR3i85v0tT3Fg4+145irygVWMHo3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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