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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8c552c2550245f7b4666fcf391e4172326c50061cb692de96502933cc1caa5' 
  AND token = '5NFAA4n2C9/Oyg/EsxevA0qmqrQrKHC2xX6OS7TLwzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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