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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68388aeb5c252734b0de98c99493e51a6c3b0703470fafebf0d56c4770a3a51' 
  AND token = 'IjKKcXkkH5tbowzJ/mDVQk4+8jrp1JeOPoYaSe50wq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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