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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9c406f1c3248c8c67a9a3081640ff342b6e5d7ca0a5401542068f8fc55a831' 
  AND token = 'EduvVANjijfYx900TuuIOQuNkcscdnFCLZMiUSVEk10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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