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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12b32ac7d3649e933cc30033be8ee406bbfcc8a4caa256ecc3062c76289f296' 
  AND token = 'L+k92qxTbOoZDEob4r2x/tQd+5hcM5BxTcm/Q7mUNbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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