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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bcaacce8363814e65c66e1f8b51b5cb9648bbec0f0418a3f0d3abea63ef96e' 
  AND token = 'TIF1Ih7YAcLrsG4K3v6jX/kbuteT8ihR8meTrjCjlwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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