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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc41f7ad612b8342f34aff966decbebc238698b57c31aebf7b0aac16bfb6cc3e' 
  AND token = 'Crla9Fo2iL2c4rYAzo1pLiYtPLcfrctZTnsb8XlQB0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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