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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8116de2d508143c64776cfcd83eda8fa292db88ababd7585064edb7e8c99f5' 
  AND token = 'Bvwm2z+xmTbfldLX57QtYGifHdPIkmnWYVe2mZ96FkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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