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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef39b91719405b90c1fb90c9dc20f820421fb146459b34fcdbad2a672594b54' 
  AND token = '7FqnLCf159fDxZfvlVNruqK9hPnO6FE6yJtYgFMa7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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