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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62bfd9d940652a0283b6340702d465b99e5518ce8ae865b61c9cf5f55329af2' 
  AND token = 'WP4BGnztvBkcEJ5NXJngUWE9TcpRzgB54Uagt1b7brk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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