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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20fd038bf81375805ba8989224501aee2c32ead0e0f24c72d51ca9c1d9ece1da' 
  AND token = 'Z/tgoNeGTHktY0DVExrvJ8v1oc6h4l+k6H4G10KlVpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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