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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab97f73439db99c40d8fb538f3d8d2b94ff2bf2e734349b7f7a2d5c5a9583fa' 
  AND token = 'c/NaMLUW9yb/r4Gk3g+so95maMVyw4wjOv7OLeftKxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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