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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10170c9a21caec2d7167de0c307534ceca9445f8a75bb23b1234f31fe25f0ef6' 
  AND token = 'PqwxtGD7mls1Z03dXAUA/JQwd8itfTfbb7FVjylhyog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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