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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a499e25fd8ec4ed114f8503eb24f0907fe2f1d06f4ac87d41b1d0aa71b971d8' 
  AND token = 'BxXz55/xoaOYIhbaJo8PGPhLNvCaHx+KuKc4ERAGf20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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