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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9c6d0f87da717500db52afe7b896bdb76fcbc2c64b462618db4ecb462bae26' 
  AND token = 'Rgs5+i+DIurHb185+9IZoaOZ4s+GQZ0HYnGBIYV4SZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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