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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2347e0b1c6de0f2c3ae3c73ea2202be7966fbfd763ae79991677cb42b9daa3' 
  AND token = 'pHWFcRpeQdKpe/KDHLQjAC3oGFt4d4xmSkzImo8mpy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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