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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6ed15b5b31bd925a0b4836db6a530359c911730cabeac679ed032843e13889' 
  AND token = 'h9rCpcjd2mhK94qpsQdWr2tQr5hzyJDuBUeLWnGbq2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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