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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab7490c0dfd8f7baa278ac2b2ca3777dd578399297e84aff82f862bad2afa47' 
  AND token = '6bKXprX/eyxFUAMwUz47tDvblk62dappTwQaqBNdbLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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