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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f0d0b2e2d192fff9952e0aea5a483e4c38a3e9429eb9fa0089215d79437434' 
  AND token = 'RxtXe02Bw+KKYx7CirC1/n4ESZvVNJTuFnbuy/10lGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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