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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac935bedf07aa5f3380d5586baaf085205a37fb9e6b0e058f410d76b3d4eae0' 
  AND token = 'gz6PAC7oCmCgDGgI59zhJ5slx6YvFmowxYvp38Tq96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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