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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b47007b954383a7fd381233c0e85382bc1b4e553ce0b41ff6fb99f4a56f391e' 
  AND token = 'gsTjAYI+GNPEmbqqRaD7NOL2QwsPEIn6ShM8YqC+9bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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