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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e96841fd92ca3e87e354eaaceeb92d9851d90f37fd6835a0bb138f94c1f123' 
  AND token = 'sii52gj3HdsJO7dGhGjjLzKAj0UFAI3Q71OK9r8pc6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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