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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f1c716385a277345c37dbbde0eb6d0de468421119da9a995fd5b90b58d5d2e' 
  AND token = '8ksHsdaz/SaHbFabzfZAVXYvnY5pEmsolviS0OAyR00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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