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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f836fc2fc041a1535339c8c322ebb9d0602e5046296bafa81f6aaf7b0fd4f3d6' 
  AND token = 'sAJLJiILLAm9ZZFgGn0lsZUHbvzRTM4E+53lLfxhy6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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