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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a479de328d148ed335f6f8da7f2e0e1e23d4fe87d8b4036d7d18a76ece01286' 
  AND token = 'h1wJPnUeI25vBU/KkcT4JdyMtoILDo7Yspv/yLlZwsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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