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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898dd1ba37e5a9603c2d57c08f618b2fa25cc057faaf94a1e7edba66fd9a2d16' 
  AND token = '8eMTfBAEl8If++kMk+uCe4OvnKXRjmwdyWvU9blUPrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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