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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baabd4d126a749b149bbfd9bc2f2ebc2b9640b6cb15a04e41dc634ab7ea18309' 
  AND token = 'CnSb7arekB7z0apSljyvrVVx2x2WlJl8K0oFDzaBp3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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