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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3254cf750f5ffc76fe3a31fed9b57f2cbf0bcb3638a0dc3efa23bfde5d2fef40' 
  AND token = 'FEEONX55gjGXfvyhVb0q1jepwsdDhbReg+gkkmmSGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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