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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b0c8bd5d6b0e24e61df1fe89e6606a388f10ae40173877769ae712874642c0' 
  AND token = 'q2dEhCfPsmjjwV/A/waRv/yZzi4FGE6pydI0gqe3M94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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