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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbea054d8fd4a654dd00a63914b1e4e03ea3e00d742c2a095e9ba5ff16d3a33' 
  AND token = '+ofxmn/Y5mV0OMyQWCX/4ULekOSfzodEXF5wRl+7rPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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