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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fecf4d6fe67e308f2e65a56d5881fb118b2beca4ca30ef8f4d27b5de0154c33' 
  AND token = 'T6lgLqkeJWzcqqApHEMBCu1KSbF5N6kuUHKQh+0wscQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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