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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1007467c3ddf0e2fcf8ae8b4889b5654756a6e9da4c76a8377ca76bc34503d4f' 
  AND token = 'nk4PrtHl9mbf4MRJ5YpFYUmL8rc/jtHs5QOa+EtpWv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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