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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338f6015f2910d3aafc9f18c7add0f7bb03772a6cb8393890cafe36fc5a5c31d' 
  AND token = 'SGDLRvtR1VBIeme56p99280Sn2DZRgx+WOXc/2PinXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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