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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ca7c6869bbe7d6166181cd0b70cd0a897b6a3aff3d82f753ccc771b420e39e' 
  AND token = 'KXPGZdjSRkblK+g/BcOMj/5p4ooWZrLLmJksNen8w1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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