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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237fac0d80fb241550b75611378c6fb66467b595967c1c528fdfb872aec29da8' 
  AND token = '5tadi1vqkPIpiJYP+2HNFgkHAJOXSLxtAODd0ED2ne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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