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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a963f090670c85bd3c64d66d7c22a2da1a0cab8a2dd2687251e85edbc4e7ef' 
  AND token = 'e5P4xEZoy3uyPdi8Put9p27d3cUu/0jaTjdQy9Xc4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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