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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0798f1dadaed30d8e15fcf74ce69eeb4661481ae675af535c1292a8dabbcb04' 
  AND token = 'ww6ND2mr9+b1vSzmvTmS26MB+ojQFBZvyjkBF3BnOI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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