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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81d03b8d57db04c6b87068afce83afcf73403d01f72a91cdce0a920186074d0' 
  AND token = 'kiaa1BOTXdSXkl26vQsH1eQ4w/RnrQRDa/2ow4409j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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