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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ca4df7389f1aa95970e6a64ade263d5eaa8a795222883ed6bf8130e3de999d' 
  AND token = 'sne2N1Ie/9jlfANj4jo6Q71iIJXP/QlcYEbCpfo5kbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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