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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed72c87f676983e39a48c5d9bc8b52080a86a5bfc183325ea97d0ee5a3a5daeb' 
  AND token = '/T3CX3KISt6rT+e87q4djSfYJUrOf3henzJN9i5INvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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