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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4aa03b9bb8e80b69006362a5776d4675345219a73513cfd4c643ab88c4b6f4' 
  AND token = 'Z9QGte8HWZiZbQh0Z23Ts7+jaZOrfxcH+XCbCfwfGoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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