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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeab82e812f9ba187a9086ce09640f670fad739908fe9c844dc913b0f35a79b3' 
  AND token = '6HJet1AZyqI9Q1aelIyTassL3izClHce5LooX1QXztQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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