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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04ae394bb231eb481c70f90d4d465303a66c510850bcee2b94d0e8d9e54d9c' 
  AND token = 'TbOnFMDEwq9ce0o10zkotr2AXGZVbiYQ8i4CijT5Gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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