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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30430f532c5572e4652a262fdca7333d45542a7fda6b4a011bd4d8aeefa33d0a' 
  AND token = 'XJFA9sihedNIPd5cdOFFMRvts2zFKJcpB56W/MqLaDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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