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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff26d0089bfa0bdd8a5f481a4ea8194c3e0ba2ce44a107d3b3cbce03834a35af' 
  AND token = 'rDN3aUN11RlJ3sSmY8B+CbJ9V09MLkB7gSVcZRgfveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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