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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310b9d9180052b65ed0a8ebb52aae3e5a70ac622ae1bdcfa140a3d807826e964' 
  AND token = '+vjGRdBgb/ogCafSjy9Cijwl7yhRF+VC7j0JlaujUM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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