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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe41be1a1577d0950b7f0bd343b04b1da46b5e5115900ff9064ff056f8b421b' 
  AND token = 'YVAuLaAqF5JtsSJIBAzypYxY59vV4fQJI4pl8Bd+3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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