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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9456697847ad485eb8b6960e88e8a9d43ad1cb53a72a78f96919c318c3d65f64' 
  AND token = 'S5Qh3tR3DS0aHm1CvtBZf4ZUwL6SOPrU/LekS7PGlzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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