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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83df24e9cbb31c0e95245ef3f72e2fa05134a27e77eca1b640e8d2e2075dad22' 
  AND token = 'QpJ60jjplF1r2cO5P6dBFDfJAzbuazdmEGjHRWtHA8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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