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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcdd2db7dffb09484eb269e56747c2f6deae71032980208ed1b6e1c9fcbd098' 
  AND token = 'XMApJClZT+d6XebeN9CiT3S9jQTgb18LChUNGg8QqfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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