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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eee98a1c5df7840b0ce2038e92bf25e1ee865af0e44ea894894266c536e43c4' 
  AND token = '/DWilLOim0PSpoBc0KMughGBE6YJ3TDcZHnqe7X0oXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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