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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f847cda9b58f2e717c114df7482e55c40a1789522437a88da1f444c3211e2f6' 
  AND token = '1qnqw9wD7a8fuBamDdKnr4bdEv8fvENiGDX5jPn01TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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