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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c3fea539dd9e9239a74c71b8b33c53ea6fcf52ef0e6ebbbd3669e6883c913a' 
  AND token = 'd00pjgum6l8BKrQIdiLY0WB2+Z0FX7nSfOItZhI4m10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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